Straight out of the box, the Blood Pressure Dock appears to be relatively straightforward: iHealth Lab bundles a glossy white plastic dock with a blood pressure arm cuff and a USB cable. Plug your iPod touch, iPhone, or iPad into the dock and you’re prompted to download iHealth BPM, a free application from Andon Health that is required to make the BP3 hardware useful in any way. Connect the cuff to the dock, run the application, and press a…